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Allushta [10]
2 years ago
7

Solve by factorization 2x^2 + 3x -20 = 0

Mathematics
2 answers:
saul85 [17]2 years ago
4 0

Answer:

x=2.5 or x=-4

Step-by-step explanation:

factorisation= factors:1, 2, 4, 5, 10, 20 (only the positive factors)

We will use the factors 4 and 5.

=(2x-5)(x+4)=0

2x-5=0   || x+4=0

2x=+5      || x=-4

x=2.5  or x=-4

Hatshy [7]2 years ago
3 0

Answer:

x = 5/2, -4.

Step-by-step explanation:

2x^2 + 3x - 20            

NOTE:  2 * -20 = -40 so we need 2 numbers whose product is - 40 and whose sum is + 3.  These are + 8 and -5, so we write

= 2x^2 + 8x - 5x - 20     Factor by grouping:

= 2x(x + 4) - 5(x + 4)

= (2x - 5)(x + 4)

so x = 5/2, -4 are the roots.

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I need the answer to a parts I-iii and the answer to b
fomenos

Answer:

a)

i) Mean = 72

ii) Median = 72

iii) Mode = 72

b)

69, 70, 71, 72, 72, 72, 73, 74, 75

Step-by-step explanation:

<u>a. To find mean, median and mode</u>

It is given that all the 9 students get 72 marks.

Therefore the data set be,

72, 72, 72, 72, 72, 72, 72, 72 72

<u>i) mean </u>= (sum of data)/(total number of data)

 = (9 * 72)/9 = 9

<u>ii) Median </u>- Central data in the data set when arranging ascending or descending order

72, 72, 72, 72, 72, 72, 72, 72 72

Median = 72

<u>iii) Mode </u>- Most repeating data in the data set

Here mode = 72

<u>b). To find a data set</u>

69, 70, 71, 72, 72, 72, 73, 74, 75

Here Mean, mode and median are all 72

3 0
3 years ago
1/2m−5=23. What is the answer please tell me, it's very important.
olga_2 [115]

Answer:

m = 56

Step-by-step explanation:

1/2m - 5 = 23

add 5 to both sides

1/2m - 5 + 5 = 23 + 5

1/2m = 28

multiply both sides by 2

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3 0
2 years ago
What multiples to -63 and adds to two
ivolga24 [154]
That job can be handled by +9 and -7 working together.
4 0
3 years ago
Which irrational number is represented by point B?
avanturin [10]

Answer:

  B)  √229

Step-by-step explanation:

√229 is about 15.13, which is the approximate location of point B.

__

IMO, the dot at point P is a little too far to the right for √229.

6 0
3 years ago
Read 2 more answers
Solve for x.<br> -(-2–52)+(-2)=18<br><br> x=-18/5<br> x=90<br> x=18/5<br> x=-90
mars1129 [50]

Answer:

It should be x - 18/5

Step-by-step explanation:

5 0
3 years ago
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